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Geologic Hazards


Volcanoes, earthquakes, tsunamis, landslides, expansive soils and more

Yosemite RockfallYosemite Rockfall Hazards Yosemite Rockfall Hazards have been mapped by the National Park Service. Hazard InsuranceHazard Insurance Homeowner\'s Insurance and Geologic Hazards Most policies do not cover geologic hazards. Largest HurricanesLargest Hurricanes Largest Hurricanes Are they determined by wind speed, value of damage, most deaths? Impact CratersImpact Craters Asteroid Impact Craters! Zoom in on 50 of Earth\'s largest impact craters.
Expansive SoilsExpansive Soils Expansive Soil Causes more damage than floods, hurricanes & tornadoes combined. VolcanosVolcanos Volcanos Articles about volcanoes, volcanic hazards and eruptions past and present. LandslidesLandslides Landslides A USGS fact sheet about landslides and events that trigger them. Abandoned MinesAbandoned Mines Abandoned Mines accidents take 20 to 30 lives per year. Many can be prevented with education.
LiquefactionLiquefaction Liquefaction occurs when water-saturated soil is severely shaken and loses strength. Volcanic ExplosivityVolcanic Explosivity Volcanic Explosivity Rating volcanic eruptions based upon the volume of tephra ejected. Storm SurgeStorm Surge Storm Surge can be the most damaging and deadly aspect of a hurricane. Rock Fall PhotosYosemite Rock Fall Photos Yosemite Rock Fall Photos A photo sequence of a rockfall and debris avalanche by Herb Dunn.
NovaruptaNovarupta Most Powerful Eruption of the 20th Century One hour later, the blast was heard in Juneau. Tsunami CausesTsunami Causes What Causes a Tsunami? Learn how plate motions trigger earthquakes and tsunamis. Naming HurricanesHurricane Names Hurricane Names How are hurricanes named? Is your name on the list? Atlantic TsunamisAtlantic Tsunamis Atlantic Tsunamis Rare events that can cause damage and threaten millions of people.
Pacific TsunamisPacific Tsunamis Pacific Tsunamis This ocean is surrounded by plate boundaries, that can produce tsunami. San Andreas MapSan Andreas Map Google Map of the San Andreas Fault Zoom in to see the fault trace plotted atop of a map. Indian Ocean TsunamisIndian Ocean Tsunamis Indian Ocean Tsunamis Deadly tsunamis triggered by earthquakes and volcanoes.  

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